Fantasy. Science-Fiction. Horror. Some historical fiction. The order changes depending on my mood. I also read things people hand me because I am a chain reader also. I think I read faster than most folks.
I wil read non-fiction history as long as it is about any time period before 1700. I don't like romance novels unless they have Vampires, the Undead, Spaceships, Aliens, Elves, Wizards and a Dragon in them.
I've got an interesting book on business law, and another one on finance.
My son...19...prefers Philosophy and is currently working on Merton and Aquinas. He use to read Science Fiction exclusively. He also likes technical scientific books, prefering discussions of planetary exploration.
My daughter...13....will read anything that doesn't run away. ( So I've had to hide a few books.) She did the "American Girl" thing years ago, and read most of the books on the 8th grade list by 6th grade. She just finished "Foundation Trilogy" Before that it was LOTR. ( Oh Harry Potter, of course. The guy who plays Harry is sooooooooooooooooooooooooooooo CUTE ( squeel!))
She is working on Anne Rice's vampire books now, but has been eyeing my H.P. Lovecraft.
Oh, Yeah. Far Side, Calvin and Hobbs, and Peanuts compilation books. They's always good